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<p>This study investigated the effects of two solution treatments and three primary aging treatments on the microstructure and properties of DD4515 alloy. The experimental results showed that after solution treatment at 1300&#xa0;°C and above, dendritic segregation of Re and Al elements in DD4515 alloy was effectively eliminated. The as-cast <i>γ/γ′</i> eutectics and large-sized <i>γ′</i> precipitates in interdendritic regions were completely dissolved, followed by the precipitation of fine and homogeneously dispersed <i>γ′</i> particles. Different solution treatments exhibited no significant influences on the microstructure or stress rupture properties under 1100&#xa0;°C/120&#xa0;MPa. After primary aging heat treatments, the <i>γ′</i> phase exhibited a near-cuboidal morphology. With increasing aging temperature, the average <i>γ′</i> size gradually increased, while the cuboidal morphology initially improved and then degraded. The samples aged at 1120&#xa0;°C demonstrated the highest stress rupture lives, primarily attributed to the optimal combination of precipitate size and morphology achieved under this condition.</p>

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Effects of Heat Treatments on the Microstructure and Properties of a Novel Low-Cost Nickel-Based Single-Crystal Superalloy

  • 期刊论文

  • 发表日期：

    2026年6月2日

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  • Chongwei Zhu,
  • Jide Liu,
  • Zhipeng Zhang,
  • Jinchao Ma,
  • Jiaqi Lv,
  • Jiajian Wang,
  • Wenying Zhang,
  • Weihan Zhao,
  • Xinguang Wang,
  • Yizhou Zhou,
  • Jinguo Li

摘要

This study investigated the effects of two solution treatments and three primary aging treatments on the microstructure and properties of DD4515 alloy. The experimental results showed that after solution treatment at 1300 °C and above, dendritic segregation of Re and Al elements in DD4515 alloy was effectively eliminated. The as-cast γ/γ′ eutectics and large-sized γ′ precipitates in interdendritic regions were completely dissolved, followed by the precipitation of fine and homogeneously dispersed γ′ particles. Different solution treatments exhibited no significant influences on the microstructure or stress rupture properties under 1100 °C/120 MPa. After primary aging heat treatments, the γ′ phase exhibited a near-cuboidal morphology. With increasing aging temperature, the average γ′ size gradually increased, while the cuboidal morphology initially improved and then degraded. The samples aged at 1120 °C demonstrated the highest stress rupture lives, primarily attributed to the optimal combination of precipitate size and morphology achieved under this condition.